I think Magus is okey except for his right leg, which is a little awkwardly bended. Maybe Marle's pose is a little stiff... if she's supposed to be nervous, maybe she should have her head a little turned to one side? as if she was trying to look away but not really able to? that may break the stiffness, or having her do something with her hand, nervousness affects hands too, but hers looks pretty relaxed
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But take my suggestions with a grain of salt. Is this done with the tablet?
Or print it off, cut them out, and hang it from a string at different points. Compare this to a string hanging straight down with a weight on the end and trace the straight up/down line each time.
The point where all the lines intersect will give you the center of gravity. If it's too far away from the center, add weight to the opposite side of the image to balance it.
Um, when you're done with that, draw an imaginary line from the center of the image to the center of the planet, in the point in which it intersects with Lavos, that is the right balance point... no wait...